長崎県樺島のいわゆる“カラスミボラ”について

ボラ科魚類の腸型

抄録

In the present paper the writer gave a detail of the osteological study on the axial skeleton, especially on the cranium and the vertebral column, of the mature Japanese mugilid fish from Kabashima, Nagasaki Pref.
By this study the writer found the identity of this sample with Mugil cephalus LINNE and considered that this species is identical with Mugil japonicus described by Von SIEBOLD as to the sample collected from Nagasaki.
Lately BOESEMAN revised fishes collected by SIEBOLD and the sample named as Mugil japonicus was identified by him as Mugil cephalus.
Ovarian weight of the mature mullet averaged 350-400g and the female fish of this species were always longer than 45cm in body length, whereas the body length of the male fish were invariably less than 40cm.
The relationship between the body-length (L) and the body-weight (W) is given by
W=0.02817 L^2.9755
The appearance of the mullet in the waters off Kabashima and vortices movements of Tsushima currents are intimately connected.
In the additional notes the writer dealt with the intestinal convolution of the three species of the two genera, Mugil and Liza, of the Mugilidae. The intestinal convolution of Mugil cephalus (A) is the most complicated of the three and the covolut ion of Liza carinata (C) is simpler than that of Liza haematocheila (B).